Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for transmitting acknowledgement (ACK) information from a base station in an Orthogonal Frequency Division Multiplexing (OFDM) system, the method comprising: spreading the ACK information separately from other control information by applying a sequence from a set of mutually orthogonal sequences; mapping the spread ACK information to subcarriers in a pattern for increasing diversity gain of the ACK information; encoding the other control information except the ACK information according to a channel encoding scheme without spreading; and multiplexing the spread ACK information mapped to the subcarriers with the encoded other control information to transmit the multiplexed information.
2. The method of claim 1 , further comprising: additionally allocating an ACK channel when a number of terminals within a region of the base station exceeds an allowable range of a system parameter.
3. The method of claim 1 , wherein the sequence is a walsh code.
4. The method of claim 1 , wherein the ACK information is spread using a spreading factor as a system parameter.
5. The method of claim 4 , further comprising: additionally allocating an ACK channel when a number of terminals within a region of the base station exceeds an allowable range of the system parameter.
6. The method of claim 1 , wherein the mapping of the spread ACK information to the subcarriers comprises mapping the spread ACK information to the subcarriers in a particular subband.
7. The method of claim 1 , wherein the other control information comprises coded channel information.
8. The method of claim 1 , wherein the spread ACK information is mapped based on an ACK channel index.
9. The method of claim 1 , wherein the spread ACK information is mapped to a plurality of OFDM symbols.
10. The method of claim 1 , further comprising: allocating additional ACK channels based on a system parameter.
11. The method of claim 1 , wherein the pattern comprises units of multiple OFDM symbols.
12. An apparatus for transmitting acknowledgement (ACK) information in a base station of an Orthogonal Frequency Division Multiplexing (OFDM) system, the apparatus comprising: a processor for spreading the ACK information separately from other control information by applying a sequence from a set of mutually orthogonal sequences; a subcarrier mapper for mapping the spread ACK information to subcarriers in a pattern for increasing diversity gain of the ACK information; an encoder for encoding the other control information except the ACK information according to a channel encoding scheme without spreading; a multiplexer for multiplexing the spread ACK information mapped to the subcarriers with the encoded other control information to transmit the multiplexed information; and a controller for controlling an operation of the subcarrier mapper.
13. The apparatus of claim 12 , wherein when a number of terminals within a region of the base station exceeds an allowable range of a system parameter, the controller additionally allocates an ACK channel.
14. The apparatus of claim 12 , wherein the sequence is a walsh code.
15. The apparatus of claim 12 , wherein the ACK information is spread using a spreading factor as a system parameter.
16. The apparatus of claim 15 , wherein when a number of terminals within a region of the base station exceeds an allowable range of the system parameter, the controller additionally allocates an ACK channel.
17. The apparatus of claim 12 , wherein the other control information comprises coded channel information.
18. The apparatus of claim 12 , wherein the spread ACK information is mapped based on an ACK channel index.
19. The apparatus of claim 12 , wherein the spread ACK information is mapped to a plurality of OFDM symbols.
20. The apparatus of claim 12 , wherein additional ACK channels are allocated based on a system parameter.
21. The apparatus of claim 12 , wherein the pattern comprises units of multiple OFDM symbols.
22. A method for receiving acknowledgement (ACK) information in a terminal of an Orthogonal Frequency Division Multiplexing (OFDM) system, wherein the ACK information is spread by applying a sequence from a set of mutually orthogonal sequences prior to transmission of the ACK information, the method comprising: receiving and demultiplexing the ACK information and other control information from a radio channel, wherein the other control information except the ACK information is encoded according to a channel encoding scheme without spreading prior to transmission, and the ACK information is transmitted on a plurality of subcarriers mapped in a pattern to increase diversity prior to transmission; decoding the other control information according to the channel encoding scheme; and performing an inverse of the applying on the received ACK information.
23. The method of claim 22 , wherein the sequence is a walsh code.
24. The method of claim 22 , wherein the receiving and demultiplexing of the ACK information and the other control information comprises: demultiplexing the ACK information and the other control information; receiving the demultiplexed other control information through a designated path; and receiving the demultiplexed ACK information through another designated path.
25. The method of claim 22 , wherein the spread ACK information is mapped based on an ACK channel index.
26. The method of claim 22 , wherein the spread ACK information is mapped to a plurality of OFDM symbols.
27. The method of claim 22 , wherein the ACK information is spread using a spreading factor as a system parameter.
28. The method of claim 22 , wherein additional ACK channels are allocated based on a system parameter.
29. The method of claim 22 , wherein the pattern comprises units of multiple OFDM symbols.
30. An apparatus for receiving acknowledgement (ACK) information in a terminal of an Orthogonal Frequency Division Multiplexing (OFDM) system, wherein the ACK information is spread by applying a sequence from a set of mutually orthogonal sequences prior to transmission of the ACK information, the apparatus comprising: a reception module for receiving and demultiplexing ACK information and other control information from a radio channel, wherein the other control information except the ACK information is encoded according to a channel encoding scheme without spreading prior to transmission, and the ACK information is transmitted on a plurality of subcarriers mapped in a pattern to increase diversity prior to transmission; a decoder for decoding the other control information according to the channel encoding scheme; an inverse processor for performing an inverse of the applying on the received ACK information; and a controller for controlling an operation of the inverse processor.
31. The apparatus of claim 30 , wherein the sequence is a walsh code.
32. The apparatus of claim 30 , wherein the ACK information and the other control information is demultiplexed in a reception process, the demultiplexed other control information being received through a designated path and the demultiplexed ACK information being received through another designated path.
33. The apparatus of claim 30 , wherein the spread ACK information is mapped based on an ACK channel index.
34. The apparatus of claim 30 , wherein the spread ACK information is mapped to a plurality of OFDM symbols.
35. The apparatus of claim 30 , wherein the ACK information is spread using a spreading factor as a system parameter.
36. The apparatus of claim 30 , wherein additional ACK channels are allocated based on a system parameter.
37. The apparatus of claim 30 , wherein the pattern comprises units of multiple OFDM symbols.
38. An Orthogonal Frequency Division Multiplexing (OFDM) system for transmitting and receiving acknowledgement (ACK) information, the system comprising: a transmitter for spreading the ACK information separately from other control information by applying a sequence from a set of orthogonal sequences for transmission, mapping the spread ACK information to subcarriers in a pattern for increasing diversity gain of the ACK information for transmission, encoding the other control information except the ACK information according to a channel encoding scheme without spreading, and multiplexing the ACK information mapped to the subcarriers with the encoded other control information to transmit; and a receiver for demultiplexing the ACK information and the other control information received from a radio channel, decoding the other control information except the ACK information according to the channel encoding scheme, and performing an inverse of the applying on the received ACK information.
39. The system of claim 38 , wherein the spread ACK information is mapped based on an ACK channel index.
40. The system of claim 38 , wherein the spread ACK information is mapped to a plurality of OFDM symbols.
41. The system of claim 38 , wherein the sequence is a walsh code.
42. The system of claim 38 , wherein the ACK information is spread using a spreading factor as a system parameter.
43. The system of claim 38 , wherein additional ACK channels are allocated based on a system parameter.
44. The system of claim 38 , wherein the pattern comprises units of multiple OFDM symbols.
Unknown
August 27, 2013
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